Hi my 87 300d temperature was running at or below 80 & the heat barely worked. It also has the 14 head. It's got 250k, 2nd owner, & always been taking care of. So I out an 80 degrees Wahler thermostat in it & now it's running 3/4 the way to the next line(assuming that's 100?).

Is this normal or too hot? Someone told me to put a 71 degrees one in but I would like the heat to work. It never teaches 100. I tried to see if it would go there but couldn't. The fan clutch works fine. Very worried due to the 14 head.

The heat is definitely hot now but the car is running at about 90-95 degrees. It's was definitely not hot before I changed the thermostat when it was at about 80. I did flush the system too. Maybe that helped with the heat. It would barely run at 80 degrees this summer when it was 100 outside. The thermostat was definitely not working or maybe the flush cleaned up the sensor- if that's possible.

I was just worried about the running temperature running at 90-95 all the time because of the #14 head. Some of these threads get me so paranoid about it!

While 90-95 is hotter than it should be, it's not hot enough to do any harm from everything I've read. Your aux fans would kick in at 105 or 107 (I forget which). There are a number of variables....might be somewhat difficult to figure out the cause.